Other Parts Discussed in Thread: CC2531
Hey everybody,
I build a circuit with the CC2530, the Johanson Technology 2450BM15A0002E as BAUD and connected all the necessary components (see below).
The schematic:
- C16,C17 = 27pF
- C18 = 220pF
- C19-C23 = 100nF
- C24,C25 = 1uF
- C26 = 1pF
- R18 = 56k Ohm
- R19 = 0 Ohm
The PCB:
(C20 was resoldered properly after I took the photo)
Connecting the chip via debugger now works fine, but it fails to receive or send Zigbee Packages. For reference I also tried my CC2531-USB Stick, which works just fine.
Connected to the TI SmartRF Studio 7, the “continuous RX”-RSSI-graph of the CC2530 sits at roundabout -3dBm constantly, the CCA and LOCK_STATUS indicators are both off all the time. The CC2531 sits at -105dBm when not receiving packages and the indicators are both on.
My design is based on the reference designs provided by Texas Instruments. I checked the designs multiple times now but cannot find a part which is different/could cause this problem. The only part different is the C26 Cap, which has a value of 1pF instead of .5pF. However, in the datasheet of the BAUD, the blocking Cap is not required. Therefore, I removed the C26 Cap, but no difference.
Did I miss a component, or did a layout mistake?
Cheers,
Dieter
